Brain Crash
"Brain games" are all the rage these days. Nintendo's got its Brain Training game for Nintendo DS, and there are plenty of clones out there for DS and PSP.
Brain Crash (with the tag line "Your brain doesn't work right") falls into the above category and is downloadable online. Brain Crash focuses on colors. The idea is to click on the color of the word written. Sounds easy, right? Not so fast. Often the word "green" will appear but written in red. Your brain gets confused and you might actually make a mistake. There is a time limit to make things that much more difficult. The longer it takes to answer, the fewer points you get.
Brain Crash is pretty minimalist graphics- and sound-effects-wise, but lots of bells and whistles aren't necessary here. Try it. It's addictive!
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